Art of Java web development by J Neal Ford

By J Neal Ford

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Finally, the servlet adds the updated cart back to the session and generates the footer. The fourth page: confirmation The fourth and final page of the application adds a new order (with corresponding line items) and provides a confirmation number to the user. 5. 14. 14 The Confirmation servlet inserts the new order and provides a confirmation number. 5 The Confirmation page indicates that the order was placed successfully, implying a series of behind-the-scenes activities. println("

"); } } Even though the output is minimal, the Confirmation servlet has one of the most complex tasks to perform.

The getOrderKey() method, called from addOrder(), calls the MySQL specific stored procedure to get the newly generated order key, which is then used to add line item records via the call to the insertLineItems() method. The last order of business for the addOrder() method is to commit the changes to both tables via the commit() method of the connection. The catch block ensures that the entire transaction is rolled back upon failure via the call to rollback(). The Confirmation servlet in turn displays the ID number of the order as the confirmation number for the user.

While this is certainly handy in our example, it violates one of the rules we encounter later concerning the separation of logic and presentation. However, in this case, it is an expedient way to output the shopping cart. This class also contains methods to both calculate the cart total and show it as currency. 12. The method retrieves the parameters passed from the catalog, establishes a connection to the database, and adds a new record to the shopping cart. The catalog servlet passes only the item ID and quantity, so the addItemToCart() method must use that to build up all the information about an item in the cart.

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